A girder crane adapted for the truss-type installation of steel truss girders and a bridge erection method

Abstract

The present application relates to a beam erection crane and a bridge erection method suitable for steel truss and truss piece installation, a temporary shelving platform for temporary storage of bridge panels is provided in the accommodating space of the frame structure; two sets of longitudinal adjustment mechanisms are installed on the top of the frame structure, and a crossbeam assembly is installed thereon, and the crossbeam assembly is connected to a lifting system through two transverse adjustment mechanisms; during the erection of a segment steel truss, the longitudinal adjustment mechanism and the transverse adjustment mechanism can realize smooth adjustment of the lifting width and the transverse lifting distance, and the lifting system can perform longitudinal and transverse position adjustments during the lifting process without the need for large angle rotation adjustment, so as to realize precise adjustment of the elevation, longitudinal and transverse positions of the hoisted objects, and the joint adjustment of various actions improves efficiency, and can also be adjusted separately without affecting each other; before the installation of the lower bridge panel, the upper bridge panel is lifted and temporarily stored on the temporary shelving platform, which effectively solves the problem that it is difficult to lift the upper bridge panel from under the bridge after the installation of the lower bridge panel.

Description

Technical Field

[0001] The present application relates to the technical field of steel truss cable-stayed bridge construction, and in particular to a beam erection crane and a bridge erection method suitable for steel truss truss plate installation. Background Art

[0002] my country's infrastructure construction has seen significant growth in recent years, particularly in the bridge sector. Steel truss cable-stayed bridges, with their large spans, high structural rigidity, and excellent wind resistance, are widely used in both road and rail transport. Currently, the steel trusses of large-span cable-stayed bridges are typically constructed by transporting and hoisting the entire truss segment by water. The segment length can be single, double, or multi-span, depending on the requirements.

[0003] As infrastructure gradually improves, new bridges often exist upstream and downstream of existing ones. These bridges, limited by existing construction conditions, generally have low navigation clearances, making it difficult to transport the entire steel truss section of the new bridge. Therefore, when navigation clearances are limited or for other reasons, the steel trusses of cable-stayed bridges can also be erected using a truss-piece method. The currently used rotary girder-erecting cranes are heavy and expensive, and they also present the following technical issues:

[0004] When the boom is pitched to adjust the lifting distance, the hook will also rise and fall at the same time, making it difficult to align the steel beams when erecting them; the main trusses and the lower bridge deck are lifted and installed from the bottom, while the upper bridge deck is lifted and installed from the side. The crane boom needs to be rotated a certain angle before lifting the upper bridge deck. During lifting, the crane and the upstream and downstream of the steel beams are subjected to uneven force, and the steel trusses are torsional deformed, which is not conducive to the precise alignment and control of the line shape of the steel truss segments. The construction quality and effect are difficult to guarantee, so it is urgent to solve the above problems. Summary of the Invention

[0005] The embodiments of the present application provide a beam erection crane and a bridge erection method that are suitable for the installation of steel trusses and truss plates, so as to solve the problem that the slewing beam erection crane used in the related art, when adjusting the lifting distance by pitching the boom and rotating to lift the upper panel during construction, causes uneven forces on the crane and the steel beams upstream and downstream, making it difficult to ensure the precise alignment of the steel truss segments and control the linear shape.

[0006] In a first aspect, a beam erecting crane adapted for steel truss girder truss plate installation is provided, comprising:

[0007] The frame structure is provided with a U-shaped opening, which extends downward from the top of the frame structure to the designed depth to form a storage space; a temporary shelving platform for temporarily storing the bridge deck is provided in the storage space;

[0008] Two sets of longitudinal adjustment mechanisms are installed on the top of the frame structure and located on both sides of the accommodating space in the transverse direction;

[0009] The crossbeam assembly is movably mounted on the frame structure through two sets of longitudinal adjustment mechanisms, and is provided with two coaxial transverse adjustment mechanisms; the two transverse adjustment mechanisms are respectively connected to a set of lifting systems; the longitudinal adjustment mechanism and the transverse adjustment mechanism are respectively used to adjust the lifting width and the transverse lifting width.

[0010] In some embodiments, the frame structure includes a longitudinal beam and two diamond trusses;

[0011] Among them, two diamond trusses are spaced apart along the transverse direction of the bridge, and the two diamond trusses are connected by a temporary shelving platform;

[0012] The longitudinal beams are respectively arranged at the top and bottom of each diamond truss; the longitudinal adjustment mechanism is installed on the longitudinal beam at the top of the diamond truss; and there is a designed distance between the temporary shelving platform and the longitudinal beam at the bottom of the diamond truss.

[0013] In some embodiments, the system further includes a frame structure longitudinal movement system, a front support point, a rear support point, and an anchoring device;

[0014] The frame structure longitudinal movement system is used to push the frame structure, and the anchoring device is used to anchor the frame structure on the existing bridge; the front support point and the rear support point are arranged between the bottom of the frame structure and the existing bridge.

[0015] In some embodiments, the beam assembly includes a large beam, and both ends of the large beam are connected to support bases.

[0016] In some embodiments, the top of the frame structure is provided with a longitudinal guide groove slidably connected to the support base;

[0017] The longitudinal adjustment mechanism includes a first driving oil cylinder that is telescopic along the longitudinal bridge direction, and the output end of the first driving oil cylinder is connected to the support base.

[0018] In some embodiments, the top of the frame structure is provided with a longitudinal guide groove slidably connected to the support base;

[0019] The longitudinal adjustment mechanism includes a first drive motor and a first lead screw arranged along the longitudinal bridge direction; the first lead screw passes through the support base and is threadedly connected to the support base; one end of the first lead screw is connected to the mounting support seat, and the other end is connected to the output shaft of the first drive motor.

[0020] In some embodiments, the lateral adjustment mechanism includes a movable slider and a second driving cylinder, and the large crossbeam passes through the movable slider; the second driving cylinder is fixedly arranged on the support base in the transverse direction, and the output end of the second driving cylinder is connected to the movable slider; the lifting system is connected to the movable slider.

[0021] In some embodiments, the lateral adjustment mechanism includes a fixed slider and a second lead screw, and the fixed slider is fixedly connected to the large beam; a movable slider is slidably provided on the large beam and located between the fixed slider and the support base; one end of the second lead screw is rotatably connected to the fixed slider, and the other end is passed through the movable slider and is connected to a second drive motor, and the second drive motor is connected to the support base.

[0022] In a second aspect, a bridge erection method is provided, comprising the following steps:

[0023] Assemble a beam erection crane suitable for steel truss beam and truss plate installation on an existing bridge;

[0024] Use the lifting system to lift the main truss to the installation height and install it;

[0025] The upper bridge deck is lifted using the longitudinal adjustment mechanism and lifting system, and then moved back and placed on a temporary laying platform;

[0026] After adjusting the transverse lifting width using the transverse adjustment mechanism and the lifting system, the lower bridge deck is lifted to the installation position for assembly; after the installation is completed, the longitudinal adjustment mechanism and the lifting system are again used to move the upper bridge deck forward to the installation position for assembly, thereby completing the installation of a segmental steel truss;

[0027] Repeat the above steps to complete the installation of all segmental steel trusses.

[0028] In some embodiments, before using the lifting system to hoist the main trusses, the upper bridge deck, and the lower bridge deck, the following operations are performed:

[0029] Compare the width of the upper bridge deck to the width of the lower bridge deck;

[0030] If the width of the upper deck is smaller than that of the lower deck, the main trusses should be hoisted first, followed by the upper and lower decks.

[0031] If the width of the upper bridge deck is greater than that of the lower bridge deck, the upper bridge deck shall be hoisted first, and then the main trusses and the lower bridge deck shall be hoisted in sequence.

[0032] The beneficial effects of the technical solution provided by this application include:

[0033] The embodiment of the present application provides a beam erection crane and a bridge erection method that are suitable for the installation of steel trusses and truss plates. Since the frame structure has a designed height and an accommodating space, a temporary shelving platform extending along the transverse direction of the bridge is provided in the accommodating space; two sets of longitudinal adjustment mechanisms are installed on the top of the frame structure, and the beam assembly is movably installed on the frame structure through the longitudinal adjustment mechanism, and two transverse adjustment mechanisms are provided thereon; the two transverse adjustment mechanisms are respectively connected to a set of lifting systems; during the erection of a segmental steel truss, the position of the crane remains unchanged, and the lifting width can be adjusted under the control of the longitudinal adjustment mechanism, and then the position of the lifting system, that is, the transverse lifting distance, is adjusted through the transverse adjustment mechanism to install the upper bridge deck and the lower bridge deck. Since the lifting process mainly involves longitudinal and lateral position adjustments, there is no need for large angle adjustments to achieve precise adjustment of the elevation, longitudinal and lateral positions of the lifted object. Each action can be adjusted jointly to improve efficiency, or can be adjusted individually without affecting each other. Before the lower bridge deck is installed, the upper bridge deck is lifted and temporarily stored on a temporary shelving platform, which effectively solves the problem of difficulty in lifting the upper bridge deck from under the bridge after the lower bridge deck is installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 A front view of a beam erection crane adapted for steel truss truss piece installation provided in an embodiment of the present application;

[0036] Figure 2 A right side view of a beam erection crane adapted for steel truss truss piece installation provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of the connection between the longitudinal adjustment mechanism and the crossbeam assembly provided in an embodiment of the present application;

[0038] Figure 4 A schematic diagram of a beam erection crane adapted for steel truss truss piece installation according to an embodiment of the present application temporarily placing the upper bridge deck on a platform;

[0039] Figure 5 A schematic diagram of the general flow of the bridge erection method provided in an embodiment of the present application.

[0040] In the figure: 1. Frame structure; 100. Diamond truss; 101. Longitudinal beam; 2. Frame structure longitudinal movement system; 3. Longitudinal adjustment mechanism; 4. Crossbeam assembly; 5. Transverse adjustment mechanism; 6. Lifting system; 7. Temporary shelving platform; 8. Main truss; 9. Upper bridge deck; 10. Lower bridge deck; 11. Front support; 12. Rear support; 13. Anchoring device; 14. Accommodation space. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] The embodiments of the present application provide a beam erection crane and a bridge erection method that are suitable for the installation of steel trusses and truss plates, so as to solve the problem that the slewing beam erection crane used in the related art, when adjusting the lifting distance by pitching the boom and rotating to lift the upper panel during construction, causes uneven forces on the crane and the steel beams upstream and downstream, making it difficult to ensure the precise alignment of the steel truss segments and control the linear shape.

[0043] See also Figure 1-Figure 5 A beam erecting crane adapted for steel truss beam truss piece installation comprises: a frame structure 1, a longitudinal adjustment mechanism 3, a temporary shelving platform 7, a crossbeam assembly 4, a transverse adjustment mechanism 5 and a lifting system 6;

[0044] Among them, the frame structure 1 has a designed height in the vertical direction, and is provided with a U-shaped opening, which extends downward from the top of the frame structure 1 to the designed depth to form an accommodating space 14. A temporary shelving platform 7 for temporarily storing bridge panels extending along the transverse direction of the bridge is provided in the accommodating space 14. The accommodating space 14 can be understood as a U-shaped opening space; the accommodating space 14 not only provides an installation space for the temporary shelving platform 7, but also provides a passage for the lifting system 6 and the upper bridge deck 9 to pass through, which facilitates the movement of the lateral adjustment mechanism 5 and the lifting system 6 without being blocked.

[0045] Two sets of longitudinal adjustment mechanisms 3 are mounted on top of the frame structure 1 and located on either side of the accommodating space 14 in the transverse direction. A crossbeam assembly 4 is movably mounted on the frame structure 1 via the two sets of longitudinal adjustment mechanisms 3 and is equipped with two coaxial transverse adjustment mechanisms 5. Each transverse adjustment mechanism 5 is connected to a corresponding lifting system 6. The longitudinal adjustment mechanisms 3 and transverse adjustment mechanisms 5 are used to adjust the lifting width and transverse hoisting width, respectively.

[0046] Through the above arrangement, during the erection of a segmented steel truss, the entire crane position remains unchanged, and the lifting width can be smoothly adjusted under the control of the longitudinal adjustment mechanism 3. There will be no problem in the related art where the hook will rise and fall simultaneously when the boom pitches to adjust the lifting distance, causing difficulty in alignment during the erection of the steel beam.

[0047] The upper bridge deck 9 and the lower bridge deck 10 are installed by adjusting the position of the lifting system 6 through the transverse adjustment mechanism 5. Since the lifting process mainly involves longitudinal and transverse position adjustments, no large angle rotation adjustment is required. During the above process, the suspended object can be adjusted longitudinally, transversely, and vertically to achieve precise adjustment of the elevation, longitudinal, and transverse position of the suspended object. Each action can be adjusted jointly to improve efficiency, or individually without affecting each other. Before the lower bridge deck is installed, the upper bridge deck 9 is lifted and temporarily stored on a temporary shelving platform, effectively solving the problem of difficulty in lifting the upper bridge deck from under the bridge after the lower bridge deck is installed.

[0048] This makes it more convenient to connect the steel truss segments with the corresponding bolts, and the installation and construction of the steel truss is more efficient. In addition, the upper bridge deck 9 can be temporarily stored on the temporary holding platform 7 without occupying the bridge deck space, which effectively solves the problem of spatial interference when installing the lower bridge deck 10 and the upper bridge deck 9. In addition, in the above steps, the crane and the upstream and downstream steel beams are evenly stressed, and there is no torsional deformation in the steel truss.

[0049] Furthermore, since the two coaxial transverse adjustment mechanisms 5 are each connected to a hoisting system 6, the distance between the two coaxial transverse adjustment mechanisms 5 can be adjusted to accommodate bridge decks of varying widths, i.e., steel trusses of varying widths, thereby increasing usable space. The terms "longitudinal" and "transverse" refer to the longitudinal and transverse directions of the bridge, respectively.

[0050] In some preferred embodiments, in order to reduce the deadweight of the beam erecting crane and ensure its own strength structure, the following settings are provided:

[0051] The frame structure 1 includes a longitudinal beam 101 and two diamond trusses 100;

[0052] Among them, two diamond trusses 100 are arranged at intervals along the transverse direction of the bridge, and the two diamond trusses 100 are connected by a temporary shelving platform 7; there is a designed distance between the temporary shelving platform 7 and the longitudinal beam 101 at the bottom of the diamond truss 100; longitudinal beams 101 are respectively set at the top and bottom of each diamond truss 100; the longitudinal adjustment mechanism 3 is installed on the longitudinal beam 101 at the top of the diamond truss 100; the temporary shelving platform 7 is installed between the two diamond trusses 100, and there is a designed distance between it and the longitudinal beam 101 at the bottom of the diamond truss 100, and the designed distance is designed according to needs.

[0053] The diamond-shaped trusses 100 on either side are the primary load-bearing components. The longitudinal beams 101 thereon provide mounting locations for the longitudinal adjustment mechanism 3. They also form a structure with a receiving space 14, thereby reducing the weight of the beam-erecting crane. The corresponding temporary shelving platform 7 also requires weight reduction. The temporary shelving platform 7 comprises two transverse platform plate structures spaced apart along the longitudinal direction of the bridge. These transverse platform plate structures comprise a platform plate and multiple V-shaped connecting rods at the bottom of the platform plate.

[0054] Furthermore, it also includes a frame structure longitudinal movement system 2, a front fulcrum 11, a rear fulcrum 12 and an anchoring device 13; wherein, the frame structure longitudinal movement system 2 is used to push the frame structure 1, and the anchoring device 13 is used to anchor the frame structure 1 on the existing bridge; the front fulcrum 11 and the rear fulcrum 12 are arranged between the bottom of the frame structure 1 and the existing bridge; the front fulcrum 11 and the rear fulcrum 12 make the force of the frame structure 1 balanced and stable, and cooperate with the anchoring device 13 to be stably installed on the existing bridge, so that the crane and the steel beam are evenly stressed upstream and downstream.

[0055] Among them, the frame structure longitudinal movement system 2 includes a longitudinal movement track and a pushing cylinder, and the frame structure 1 can move on the longitudinal movement track through the pushing cylinder.

[0056] In some preferred embodiments, the structure of the longitudinal adjustment mechanism 3 is described in detail as follows:

[0057] The corresponding crossbeam assembly 4 includes a large crossbeam with support bases connected to both ends of the large crossbeam;

[0058] In the first form, a longitudinal guide groove is provided on the top of the frame structure 1 and is slidably connected to the support base; the longitudinal adjustment mechanism 3 includes a first driving cylinder that is telescopic along the longitudinal bridge direction, and the output end of the first driving cylinder is connected to the support base.

[0059] In the second form, a longitudinal guide groove is provided on the top of the frame structure 1 which is slidably connected to the support base; the longitudinal adjustment mechanism 3 includes a first drive motor and a first lead screw arranged along the longitudinal bridge direction; the first lead screw passes through the support base and is threadedly connected to the support base; one end of the first lead screw is connected to a mounting support seat, and the other end is connected to the output shaft of the first drive motor.

[0060] From the above description, it is sufficient as long as it has a huge driving force and is retractable, and a remote control operating device can be added for easy control.

[0061] In some preferred embodiments, the structure of the lateral adjustment mechanism 5 is described in detail as follows:

[0062] The corresponding crossbeam assembly 4 includes a large crossbeam with support bases connected to both ends of the large crossbeam;

[0063] In the first form, the lateral adjustment mechanism 5 includes a movable slider and a second driving cylinder, and the large crossbeam passes through the movable slider; the second driving cylinder is fixedly arranged on the supporting base in the transverse direction of the bridge, and the output end of the second driving cylinder is connected to the movable slider; the lifting system 6 is connected to the movable slider.

[0064] In the second form, the lateral adjustment mechanism 5 includes a fixed slider and a second lead screw, the fixed slider is fixedly connected to the large crossbeam; a movable slider is slidably provided on the large crossbeam and located between the fixed slider and the support base; one end of the second lead screw is rotatably connected to the fixed slider, and the other end is passed through the movable slider and is connected to the second drive motor, and the second drive motor is connected to the support base.

[0065] From the above description, it is sufficient as long as it has a huge driving force and is retractable, and a remote control operating device can be added for easy control.

[0066] In addition, the above transverse adjustment mechanism 5 and longitudinal adjustment mechanism 3 may also be provided with a locking mechanism to improve the installation performance during the hoisting process. The above longitudinal adjustment mechanism 3 and transverse adjustment mechanism 5 include but are not limited to the above mechanisms.

[0067] This application also proposes a bridge erection method, which includes the following steps:

[0068] Transport the main truss 8, the upper bridge deck 9 and the lower bridge deck 10 to the designated location below the existing bridge;

[0069] S1. Assemble a beam erection crane suitable for steel truss girder and truss plate installation on the existing bridge;

[0070] S2. Use the lifting system 6 to lift the main truss 8 to the installation height and install it; use the longitudinal adjustment mechanism 3 and the lifting system 6 to lift the upper bridge deck 9 and move it back to place it on the temporary shelving platform 7;

[0071] S3. Use the lateral adjustment mechanism 5 and the lifting system 6 to lift the lower bridge deck 10 to the installation position for assembly. After the installation is completed, use the longitudinal adjustment mechanism 3 and the lifting system 6 again to move the upper bridge deck 9 forward to the installation position for assembly, thereby completing the installation of one segmental steel truss.

[0072] S4. Repeat the above steps to complete the installation of all segmental steel trusses. Specifically, disconnect the beam erection crane adapted for steel truss piece installation from the existing bridge, move the entire beam erection crane adapted for steel truss piece installation to the set position, and re-anchor it. Repeat the above steps to complete the installation of all segmental steel trusses.

[0073] Before using the lifting system 6 to hoist the main truss 8, the upper bridge deck 9 and the lower bridge deck 10, the following operations are performed:

[0074] Compare the width of the upper deck 9 with the width of the lower deck 10. If the width of the upper deck 9 is smaller than that of the lower deck 10, first hoist the main girders 8, then hoist the upper deck 9 and lower deck 10. Only then can the upper deck 9 pass through the gaps between the main girders 8. If the width of the upper deck 9 is larger than that of the lower deck 10, first hoist the upper deck 9, then hoist the main girders 8 and lower deck 10 in sequence.

[0075] In the above erection method, during the erection of a segmented steel truss, the entire crane position remains unchanged, and the lifting width can be adjusted under the control of the longitudinal adjustment mechanism 3. This avoids the problem in the related art where the hook simultaneously rises and falls when the boom pitches to adjust the lifting distance, causing difficulty in aligning the steel beam during erection. The upper bridge deck 9 and the lower bridge deck 10 are installed by adjusting the position of the lifting system 6 through the transverse adjustment mechanism 5. Since the lifting process mainly involves longitudinal and transverse position adjustments, no large angle rotation adjustment is required, making it easier to align the bolts of the steel truss segments and more efficient in steel truss installation. In addition, the upper bridge deck 9 can be temporarily stored on the temporary shelving platform 7, which does not occupy bridge deck space. The upper bridge deck 9 does not need to be hoisted from the side, effectively solving the problem of spatial interference between the lower bridge deck 10 and the upper bridge deck 9 during installation. In addition, in the above steps, the crane and the steel beam are evenly stressed upstream and downstream, and the steel truss does not suffer from torsional deformation. The present application can realize the truss-piece erection of large-segment steel trusses, with a simple and clear construction method, low operational difficulty, and high construction efficiency.

[0076] A method for installing a steel truss beam truss piece is given below:

[0077] With the assistance of the turning tool on the transport ship, the lifting system 6 on one side lifts and turns over the main girder 8. After the main girder 8 is hoisted vertically, it is lifted to a height higher than the position of the transport ship and hung in the air to wait. After the main girder 8 on the other side is also hoisted vertically according to the above steps, the two lifting systems 6 synchronously lift the main girder 8 on both sides. The lifting system 6 lifts the upper bridge deck 9 and lifts it from the gap between the two main girder 8 to above the bridge deck. The lifting height must be higher than the temporary shelving platform 7. The longitudinal adjustment mechanism 3 enables the two lifting systems 6 to drive the upper bridge deck 9 to move backward and longitudinally, and temporarily place the upper bridge deck 9 on the temporary shelving platform 7. The lifting system 6 moves forward, then hoists the lower bridge deck 10, and then moves the lower bridge deck 10 to the installation position to complete the erection of a segment steel truss.

[0078] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0079] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0080] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A beam erecting crane adapted for steel truss beam truss piece installation, characterized in that: It includes: A frame structure (1) is provided with a U-shaped opening, the U-shaped opening extending downward from the top of the frame structure (1) to a designed depth to form a receiving space (14); a temporary shelving platform (7) for temporarily storing the bridge deck is provided in the receiving space (14); Two sets of longitudinal adjustment mechanisms (3) are installed on the top of the frame structure (1) and are located on both sides of the accommodating space (14) in the transverse direction; A crossbeam assembly (4) is movably mounted on the frame structure (1) via two sets of longitudinal adjustment mechanisms (3), and is provided with two coaxial transverse adjustment mechanisms (5); the two transverse adjustment mechanisms (5) are respectively connected to a set of lifting systems (6); the longitudinal adjustment mechanism (3) and the transverse adjustment mechanism (5) are respectively used to adjust the lifting width and the transverse lifting width.

2. The beam erecting crane adapted for steel truss girder and truss piece installation according to claim 1, characterized in that: The frame structure (1) comprises a longitudinal beam (101) and two diamond trusses (100); Wherein, two diamond trusses (100) are spaced apart along the transverse direction of the bridge, and the two diamond trusses (100) are connected via a temporary shelving platform (7); The longitudinal beams (101) are respectively arranged at the top and bottom of each diamond truss (100); the longitudinal adjustment mechanism (3) is installed on the longitudinal beams (101) at the top of the diamond truss (100); and a designed distance is provided between the temporary shelving platform (7) and the longitudinal beams (101) at the bottom of the diamond truss (100).

3. The beam erecting crane adapted for steel truss girder and truss piece installation according to claim 1, characterized in that: It also includes a frame structure longitudinal movement system (2), a front support point (11), a rear support point (12) and an anchoring device (13); The frame structure longitudinal movement system (2) is used to push the frame structure (1), and the anchoring device (13) is used to anchor the frame structure (1) on an existing bridge; the front support point (11) and the rear support point (12) are arranged between the bottom of the frame structure (1) and the existing bridge.

4. The beam erecting crane adapted for steel truss girder and truss piece installation according to claim 1, characterized in that: The crossbeam assembly (4) comprises a large crossbeam, and both ends of the large crossbeam are connected to support bases.

5. The beam erecting crane adapted for steel truss girder and truss piece installation according to claim 4, characterized in that: The top of the frame structure (1) is provided with a longitudinal guide groove slidably connected to the support base; The longitudinal adjustment mechanism (3) comprises a first driving oil cylinder that is telescopic along the longitudinal bridge direction, and the output end of the first driving oil cylinder is connected to the support base.

6. The beam erecting crane adapted for steel truss girder and truss piece installation according to claim 4, characterized in that: The top of the frame structure (1) is provided with a longitudinal guide groove slidably connected to the support base; The longitudinal adjustment mechanism (3) comprises a first drive motor and a first lead screw arranged along the longitudinal bridge direction; the first lead screw passes through the support base and is threadedly connected to the support base; one end of the first lead screw is connected to a mounting support seat, and the other end is connected to the output shaft of the first drive motor.

7. The beam erecting crane adapted for steel truss girder and truss piece installation according to claim 4, characterized in that: The transverse adjustment mechanism (5) includes a movable slider and a second driving oil cylinder, and the large crossbeam passes through the movable slider; the second driving oil cylinder is fixedly arranged on the support base in the transverse direction of the bridge, and the output end of the second driving oil cylinder is connected to the movable slider; the lifting system (6) is connected to the movable slider.

8. The beam erecting crane adapted for steel truss girder and truss piece installation according to claim 4, characterized in that: The lateral adjustment mechanism (5) comprises a fixed slider and a second lead screw, wherein the fixed slider is fixedly connected to the large crossbeam; a movable slider is slidably provided on the large crossbeam and located between the fixed slider and the support base; one end of the second lead screw is rotatably connected to the fixed slider, and the other end thereof is penetrated by the movable slider and connected to a second drive motor, and the second drive motor is connected to the support base.

9. A bridge erection method, characterized in that: It includes the following steps: Assembling a beam erection crane adapted for steel truss beam truss plate installation as described in any one of claims 1 to 8 on an existing bridge; Using the lifting system (6) to lift the main truss (8) to the installation height, and then install it; The upper bridge deck (9) is lifted by using the longitudinal adjustment mechanism (3) and the lifting system (6), and is moved backward and placed on a temporary shelving platform (7); After adjusting the transverse hoisting width using the transverse adjustment mechanism (5) and the lifting system (6), the lower bridge deck (10) is lifted to the installation position for assembly; after the installation is completed, the upper bridge deck (9) is again moved forward to the installation position for assembly using the longitudinal adjustment mechanism (3) and the lifting system (6), thereby completing the installation of a segmental steel truss; Repeat the above steps to complete the installation of all segmental steel trusses.

10. The bridge erection method according to claim 9, wherein: Before using the lifting system (6) to hoist the main truss (8), the upper bridge deck (9) and the lower bridge deck (10), the following operations are performed: comparing the width of the upper bridge deck (9) with the width of the lower bridge deck (10); If the width of the upper bridge deck (9) is smaller than the width of the lower bridge deck (10), the main truss (8) is hoisted first, and then the upper bridge deck (9) and the lower bridge deck (10) are hoisted; if the width of the upper bridge deck (9) is larger than the width of the lower bridge deck (10), the upper bridge deck (9) is hoisted first, and then the main truss (8) and the lower bridge deck (10) are hoisted in sequence.

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